bad customer service

On 16 June I took my laptop in for a buy back and told the consultant that I can only take it out in August first week , which she said its OK she will do the buy back with an extention , and I said that's fine and she explained I will than have another month from July which comes to August, she did the contract and signed it but I never signed on the contract as she explained to me that I can come back august and get my laptop , she made copies of my id and gave me the 800 and the contract only with her signature on. I went in to store on Sunday,13 Aug at 10:30 am went straight to her and she smilled and said u fetching your laptop and I said yes, she directed me to the front till point to pay, only to hear my laptop has been sold and I was suppose to come in on the 17 July to extend the contract for my laptop . I was shocked as it was my first time doing this and to come something like this over, than the manager called her and she said to the consultant when did the customer say she will get laptop and she said august, manager told me it works like this I needed to come back and pay the extention on 17 July not in august, than another consultant said but if I would have came back on the 17 July the extention is only 2 days from that date and not till august, I was shocked really shocked , I took contract to lawyer and ask what am I to do and he pointed out that apon the aggreement I than never signed this contract its only the consultant signature on this page, did she maybe take this laptop for herself and ***** on me. This happened at west gate mall, Mitchell's plain branch "cash crusaders"